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<?php
/**
* @link http://www.yiiframework.com/
* @copyright Copyright (c) 2008 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
namespace yii\validators;
use Yii;
use yii\base\InvalidConfigException;
use yii\base\Model;
use yii\db\ActiveQuery;
use yii\db\ActiveRecord;
use yii\db\QueryInterface;
/**
* ExistValidator validates that the attribute value exists in a table.
*
* ExistValidator checks if the value being validated can be found in the table column specified by
* the ActiveRecord class [[targetClass]] and the attribute [[targetAttribute]].
* Since version 2.0.14 you can use more convenient attribute [[targetRelation]]
*
* This validator is often used to verify that a foreign key contains a value
* that can be found in the foreign table.
*
* The following are examples of validation rules using this validator:
*
* ```php
* // a1 needs to exist
* ['a1', 'exist']
* // a1 needs to exist, but its value will use a2 to check for the existence
* ['a1', 'exist', 'targetAttribute' => 'a2']
* // a1 and a2 need to exist together, and they both will receive error message
* [['a1', 'a2'], 'exist', 'targetAttribute' => ['a1', 'a2']]
* // a1 and a2 need to exist together, only a1 will receive error message
* ['a1', 'exist', 'targetAttribute' => ['a1', 'a2']]
* // a1 needs to exist by checking the existence of both a2 and a3 (using a1 value)
* ['a1', 'exist', 'targetAttribute' => ['a2', 'a1' => 'a3']]
* // type_id needs to exist in the column "id" in the table defined in ProductType class
* ['type_id', 'exist', 'targetClass' => ProductType::class, 'targetAttribute' => ['type_id' => 'id']],
* // the same as the previous, but using already defined relation "type"
* ['type_id', 'exist', 'targetRelation' => 'type'],
* ```
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @since 2.0
*/
class ExistValidator extends Validator
{
/**
* @var string the name of the ActiveRecord class that should be used to validate the existence
* of the current attribute value. If not set, it will use the ActiveRecord class of the attribute being validated.
* @see targetAttribute
*/
public $targetClass;
/**
* @var string|array the name of the ActiveRecord attribute that should be used to
* validate the existence of the current attribute value. If not set, it will use the name
* of the attribute currently being validated. You may use an array to validate the existence
* of multiple columns at the same time. The array key is the name of the attribute with the value to validate,
* the array value is the name of the database field to search.
*/
public $targetAttribute;
/**
* @var string the name of the relation that should be used to validate the existence of the current attribute value
* This param overwrites $targetClass and $targetAttribute
* @since 2.0.14
*/
public $targetRelation;
/**
* @var string|array|\Closure additional filter to be applied to the DB query used to check the existence of the attribute value.
* This can be a string or an array representing the additional query condition (refer to [[\yii\db\Query::where()]]
* on the format of query condition), or an anonymous function with the signature `function ($query)`, where `$query`
* is the [[\yii\db\Query|Query]] object that you can modify in the function.
*/
public $filter;
/**
* @var bool whether to allow array type attribute.
*/
public $allowArray = false;
/**
* @var string and|or define how target attributes are related
* @since 2.0.11
*/
public $targetAttributeJunction = 'and';
/**
* @var bool whether this validator is forced to always use master DB
* @since 2.0.14
*/
public $forceMasterDb = true;
/**
* {@inheritdoc}
*/
public function init()
{
parent::init();
if ($this->message === null) {
$this->message = Yii::t('yii', '{attribute} is invalid.');
}
}
/**
* {@inheritdoc}
*/
public function validateAttribute($model, $attribute)
{
if (!empty($this->targetRelation)) {
$this->checkTargetRelationExistence($model, $attribute);
} else {
$this->checkTargetAttributeExistence($model, $attribute);
}
}
/**
* Validates existence of the current attribute based on relation name
* @param \yii\db\ActiveRecord $model the data model to be validated
* @param string $attribute the name of the attribute to be validated.
*/
private function checkTargetRelationExistence($model, $attribute)
{
$exists = false;
/** @var ActiveQuery $relationQuery */
$relationQuery = $model->{'get' . ucfirst($this->targetRelation)}();
if ($this->filter instanceof \Closure) {
call_user_func($this->filter, $relationQuery);
} elseif ($this->filter !== null) {
$relationQuery->andWhere($this->filter);
}
if ($this->forceMasterDb && method_exists($model::getDb(), 'useMaster')) {
$model::getDb()->useMaster(function() use ($relationQuery, &$exists) {
$exists = $relationQuery->exists();
});
} else {
$exists = $relationQuery->exists();
}
if (!$exists) {
$this->addError($model, $attribute, $this->message);
}
}
/**
* Validates existence of the current attribute based on targetAttribute
* @param \yii\base\Model $model the data model to be validated
* @param string $attribute the name of the attribute to be validated.
*/
private function checkTargetAttributeExistence($model, $attribute)
{
$targetAttribute = $this->targetAttribute === null ? $attribute : $this->targetAttribute;
$params = $this->prepareConditions($targetAttribute, $model, $attribute);
$conditions = [$this->targetAttributeJunction == 'or' ? 'or' : 'and'];
if (!$this->allowArray) {
foreach ($params as $key => $value) {
if (is_array($value)) {
$this->addError($model, $attribute, Yii::t('yii', '{attribute} is invalid.'));
return;
}
$conditions[] = [$key => $value];
}
} else {
$conditions[] = $params;
}
$targetClass = $this->targetClass === null ? get_class($model) : $this->targetClass;
$query = $this->createQuery($targetClass, $conditions);
if (!$this->valueExists($targetClass, $query, $model->$attribute)) {
$this->addError($model, $attribute, $this->message);
}
}
/**
* Processes attributes' relations described in $targetAttribute parameter into conditions, compatible with
* [[\yii\db\Query::where()|Query::where()]] key-value format.
*
* @param $targetAttribute array|string $attribute the name of the ActiveRecord attribute that should be used to
* validate the existence of the current attribute value. If not set, it will use the name
* of the attribute currently being validated. You may use an array to validate the existence
* of multiple columns at the same time. The array key is the name of the attribute with the value to validate,
* the array value is the name of the database field to search.
* If the key and the value are the same, you can just specify the value.
* @param \yii\base\Model $model the data model to be validated
* @param string $attribute the name of the attribute to be validated in the $model
* @return array conditions, compatible with [[\yii\db\Query::where()|Query::where()]] key-value format.
* @throws InvalidConfigException
*/
private function prepareConditions($targetAttribute, $model, $attribute)
{
if (is_array($targetAttribute)) {
if ($this->allowArray) {
throw new InvalidConfigException('The "targetAttribute" property must be configured as a string.');
}
$conditions = [];
foreach ($targetAttribute as $k => $v) {
$conditions[$v] = is_int($k) ? $model->$v : $model->$k;
}
} else {
$conditions = [$targetAttribute => $model->$attribute];
}
$targetModelClass = $this->getTargetClass($model);
if (!is_subclass_of($targetModelClass, 'yii\db\ActiveRecord')) {
return $conditions;
}
/** @var ActiveRecord $targetModelClass */
return $this->applyTableAlias($targetModelClass::find(), $conditions);
}
/**
* @param Model $model the data model to be validated
* @return string Target class name
*/
private function getTargetClass($model)
{
return $this->targetClass === null ? get_class($model) : $this->targetClass;
}
/**
* {@inheritdoc}
*/
protected function validateValue($value)
{
if ($this->targetClass === null) {
throw new InvalidConfigException('The "targetClass" property must be set.');
}
if (!is_string($this->targetAttribute)) {
throw new InvalidConfigException('The "targetAttribute" property must be configured as a string.');
}
if (is_array($value) && !$this->allowArray) {
return [$this->message, []];
}
$query = $this->createQuery($this->targetClass, [$this->targetAttribute => $value]);
return $this->valueExists($this->targetClass, $query, $value) ? null : [$this->message, []];
}
/**
* Check whether value exists in target table
*
* @param string $targetClass
* @param QueryInterface $query
* @param mixed $value the value want to be checked
* @return bool
*/
private function valueExists($targetClass, $query, $value)
{
$db = $targetClass::getDb();
$exists = false;
if ($this->forceMasterDb && method_exists($db, 'useMaster')) {
$db->useMaster(function ($db) use ($query, $value, &$exists) {
$exists = $this->queryValueExists($query, $value);
});
} else {
$exists = $this->queryValueExists($query, $value);
}
return $exists;
}
/**
* Run query to check if value exists
*
* @param QueryInterface $query
* @param mixed $value the value to be checked
* @return bool
*/
private function queryValueExists($query, $value)
{
if (is_array($value)) {
return $query->count("DISTINCT [[$this->targetAttribute]]") == count($value) ;
}
return $query->exists();
}
/**
* Creates a query instance with the given condition.
* @param string $targetClass the target AR class
* @param mixed $condition query condition
* @return \yii\db\ActiveQueryInterface the query instance
*/
protected function createQuery($targetClass, $condition)
{
/* @var $targetClass \yii\db\ActiveRecordInterface */
$query = $targetClass::find()->andWhere($condition);
if ($this->filter instanceof \Closure) {
call_user_func($this->filter, $query);
} elseif ($this->filter !== null) {
$query->andWhere($this->filter);
}
return $query;
}
/**
* Returns conditions with alias.
* @param ActiveQuery $query
* @param array $conditions array of condition, keys to be modified
* @param null|string $alias set empty string for no apply alias. Set null for apply primary table alias
* @return array
*/
private function applyTableAlias($query, $conditions, $alias = null)
{
if ($alias === null) {
$alias = array_keys($query->getTablesUsedInFrom())[0];
}
$prefixedConditions = [];
foreach ($conditions as $columnName => $columnValue) {
if (strpos($columnName, '(') === false) {
$prefixedColumn = "{$alias}.[[" . preg_replace(
'/^' . preg_quote($alias) . '\.(.*)$/',
'$1',
$columnName) . ']]';
} else {
// there is an expression, can't prefix it reliably
$prefixedColumn = $columnName;
}
$prefixedConditions[$prefixedColumn] = $columnValue;
}
return $prefixedConditions;
}
}
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